Jet pump



y 1936. c g. WRENTMORE 2,040,890

JET PUMP Filed June "5, 1952 Patented May 19, 1936 UNITED STATES PATENT OFFICE JET PUMP Clarence G. Wrentmore, Detroit, Mich.; Margaret M. Wrentmore, special administratrix of Clarence G. Wrentmore, deceased Application June 3, 1932, Serial No. 615,159

8 Claims. (Cl. 30215) My invention relates to an improvement in jet Similar reference characters refer to similar pumps and more particularly to such a pump parts throughout the several views; adapted for use in connection with a hydraulic A device embodying my invention as shown in excavating apparatus and the like. Fig. 1 may be best understood by a consideration 5 Jet pumps heretofore have been used in eonof the diagrammatic sketches shown in Figs. 4, 5'

nection with various apparatus and consist of a 5' and 6. device in which a mass of fluid, gas or liquid may Referring to Fig. 4, if two jets of fluid g-g be be forced under high pressure andvelocity' into so directed that they meet, the two jets will a mass of fluid having a lower pressure and vemerge into a blade h, the blade It being generally locity, causing the two masses to mingle into one, fan shaped in contour, as shown in Fig. 5,. the 110 the total energy in which is the sum of the total form and direction of the blade in depending of the energy in the two original masses; upon the form and direction of the streams 9 Prior to my invention. it has been. a customary and g. If, however, the jets g and g be equal and practice to inject a mass of fluid, gas or liquid unsymmetrically placed in the same plane, the plane der high pressure and velocity into the mass of of the blade it will bisect the angle between 9 15 fluid of lower pressure and velocity through the and g and lie perpendicularly to the plane of medium. of a solid jet shot into a pipe at or near its center, or an annular jet at its perimeter. If more than two jets be br ht symmetricalh Under either of these conditions the difference o h n a r l l n as h wn n Fi ,111 in velocity of the small high-pressure jet and le i W merge into a Set Of diverging. blades 20 the larger induced suction stream causes a roll- 76, Whose planes biSeCt t d dra a s ing motion within the fluidmass, which cuts tween the jets i. This phenomenon of jet action down the efii'ciency of such devices. The intenis utilizfid in a pump embodying my inventions sity and range of this relative motion between shown 1n Figs- 1, 2 and there Shown,

the particles of the fluid passing through the flagged outer casing is Y am 25 pump determine the magnitude of the losses of terror h m through whmh the high pres energy and so the loss of efliciency of the pump; f 1s brought? x A It is, therefore, an object of my present inven- A surcnon tube by havmg i P erex' tion to provide a jet pump. which amount tends 111130 the chamber a to a point ad acent the and range of the turbulence from the jet is de; dlscharge tube c, having a casing j, which also 30 Creasei extends intothe chamber a. A small clearance It is a further object of my present invention 1s Y W? h end of th suctlon to provide a jet pump in which mixture of tube b and the adjacent end of the discharge c V tube a sufficient to permit fluid; to flow from the the mgh speed and the low speed fluld 1s facm chamber at around the suction tube 2) in the 35 tated and the entire mass reduced to a uniform velocity within a shorter time and at a shorter range than in jet pumps of conventional design.

These and various other objects, features of arrangement, construction and operation, are

plainly shown and described and will be best understood by reference to the accompanying drawform of a ring, the inner surface of which corresponds to the outer surface of the end of the suction tube b and whose outer surfacecorresponds to: the inner surface of the end. or the discharge tube 0. Some of the fluid; under pre's- 40 sure passes from the chamber a: througha plurality of slots m. The said slots m are: equally 111 W1 11ch! V displaced about the periphery of the end of the 1 15 longltuqmal sgctwn through a Jet suction tube b adjacent theend of the discharge 4:! Pump embodylng y mventlon? tube 0, and the fluid from the chamber a passes Fi 2 is a section taken on the line of through the slots 'm; inthe formrof. a plurality of F jets which meet at the center of the suction tube Fi 3 is a s t tak n n the line 3-3 f b. In the annular opening n and the slots m Fig. 1; the high pressure fluid enters the tubes b and: c

Figs. 4 and. 5 are diagrammatic sketches showin a diagonal direction, having a component 50 ing two jets meeting and merging into a single along the tube larger than the radial component. stream; The operation of a device embodying my in- Fig. 6 is a diagrammatic sketch showing sevvention is as follows: Fluid under low pressure eral jets meeting andmerging into a'series of passes through the suction tube bt'or the disradial blades. charge tube 0, and fluid from the chamber. w, 55

equally displaced about the periphery of the suction tube b, the jet action occurring within the tube 1) is similar to that shown in Fig. 6 except that the provision of six slots m, as shown in Figs. 1 and 3, will cause a correspondingly larger number of radial blades offluid than those" shown in Fig. 6 resulting from the use of .but

four jets.

A jet pump constructed in accordance with my invention will give a jet in which the extent and range of turbulence is considerably less than in conventional types of jets, and by the decreasing 0f the amount and range of the'turbulence I have found that the efficiency of the entire pump is greatly increased. a

I also have found that a jet constructed in accordance with my invention will produce a higher vacuum than any of the conventional forms of jets with which I am familiar. It also has been found that a jet pump embodying my invention when used for gravel or other grittymaterial, tends to keep the abrasive substances in the fluid suspendedin the fluid in such a manner as to reduce the scour on the surface of the discharge pipe 0. It also has been found that a jet pump embodying my invention may be used successfully on a straight run of pipe as a booster pump.

While I have illustrated and described one embodiment of my invention, it is apparent that various changes and modifications may be made without departing from the spirit of my invention, and I do not wish to be limited to the precise details of construction asherein set forth, but desire to avail myself of all changes within the scope of the appended claims. 4

Having thus described my invention, what'I claim is new and desire to secure by Letters Pat ent of the United States is: g V

1. A jet pump including an outer casing having a chamber therein, a suction tube extending through said casing to a point within saidchamber, a discharge tube extendingthrough said casing and within said chamber to a point adjacent the end of said suction tube, and means extending through said suction tube and adapted to provide a plurality of high velocity jets so placed within said suction tube adjacent the end thereof, as to form a plurality of intersecting hlades of high velocity fluid within said suction ube.

2. A jet pump including an outer casing having a chamber therein, a suction tube extending through said casing to a point within said chamber, a discharge tube extending through said casing and within said chamber to a point adjacent the endof said suction tube, and means adjavcent the end of said suction tube to provide a plurality of high velocity jets within said suction tube and including a 'plu'rality'of slots extending through the casing of said suction tubejat points equally spaced about the perimeter thereof, in

- such a manner that streams of high velocity fluid passing through said jets will meet and form a plurality'of intersecting blades of high velocity fluid within said suction tube. a r

3. A jet pump including an outer casing having a chamber thereimand having'means to limit the amount and range of turbulence in said chamber, and including a suction tube extending through said casing to a point within said chamber, a discharge tube extending through said casing and within said chamber to a point adjacent the end of said suction tube, and means extending through said suction tube and adapting a chamber therein, and having means to limit 1 'the'amount and range of turbulence in said chamber, and including a suction tube extending through said casing to a point within said chamber, a discharge tube extending through said casing and within said chamber to a point adjacent the end of said suction tube, and means adjacent the end of said suction tube to provide a plurality of high velocity jets within said suction tube and including a plurality of slots extending through-the casing of said suction tube. at' points equally spaced about the perimeter thereof and adapted to direct high velocity fluid passing therethroughto form. aplurality, of intersecting blades of such high'velocity fluid..

5. A jet pump including an outer casing having a chamber therein, a suction tube extending through said casing to a point within said chamber, a discharge tube extending through said casing and within said chamber to a point adjacent the end of said suction tube, and means to convey a fluid under pressure between said suction tube and said discharge tube and to discharge said fluid as an annularly extending band between said suction tube and said discharge tube, and means adjacent the'end of said suc-. tion tube to provide a plurality of high velocity jets within said suction tube and including a plurality of slots extending through the casing of said suction tube at points equally spaced about the perimeter thereof and adapted to di-. rect high velocity fluid passing therethrough to form a plurality of intersecting blades of such high velocity fluid.

6. A jet pump including an outer casing having a chamber therein, a suction tube extending through said casing to apoint within said chamber, a discharge tube extending through said casing and within said chamber to a point adjacent the end of said suction tube, means to convey a fluid under pressure between said suction tube and said discharge tube and to discharge said fluid as an annularly extending band between said suction tube. and said discharge tube, and means extending through said suction tube and adapted to provide a plurality of high velocity jets within said suction tube adjacent the end thereof and adapted'to direct high velocity fluid passing therethrough to form a plu-' rality 0f intersecting blades of such high velocity fluid. V 1 7. A jet pump including an outer casing having a chamber therein, and having means toliinit the amount and range of turbulence in said chamber,'and including a suction tube' extending through said casing to a point within said chamber, a discharge tube extending through said casing and within said chamber to a point adjacent the end of said suction tube, and means to convey a fluid under pressure between said suction tube and said discharge tube and to discharge and means extending through said suction tube and adapted to provide a plurality of high velocity jets within said suction tube adjacent the end thereof and adapted to direct high velocity fluid passing therethrough to form a plurality of intersecting blades of such high velocity fluid.

8. A jet pump including an outer casing having a chamber therein, and having means to limit the amount and range of turbulence in said chamber, and including a suction tube extending through said casing to a point Within said chamber, a discharge tube extending through said casing and within said chamber to a point adjacent the end of said suction tube. means to convey a fluid under pressure between said sucwithin said suction tube and including a plurality of slots extending through the casing of said suction tube at points equally spaced about the perimeter thereof and adapted to direct high velocity fluid passing therethrough to form a plurality of intersecting blades of such high velocity fluid.

C. G. WREN'I'MORE. 

